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参考 Espressif Systems Github上开源的代码，编译出完整的固件跑通Alexa。

• 源代码下载

// 下载源码，详细说明可以参考 esp-va-sdk/README-Getting-Started.md
$ git clone --recursive https://github.com/espressif/esp-idf.git
$ cd esp-idf; git checkout release/v3.1; cd ..
$ git clone https://github.com/espressif/esp-avs-sdk.git
// 打补丁
$ cd esp-idf
$ git apply ../esp-avs-sdk/esp-idf-patches/memset-i2s-dma-buffers-zero.patch
$ git apply ../esp-avs-sdk/esp-idf-patches/esp-tls-Add-support-for-global-CA-store.-All-mbedtls.patch

• 配置相关参数

make menuconfig

Component config -> ESP32 Specific -> SPI RAM config -> Type of SPIRAM  in use->select ESP-PSRAM64 

• 擦除Flash

make erase_flash
esptool --port /dev/ttyUSB0 erase_flash

• 编译代码/烧录固件

// 编译加监控串口输出
make -j 4 flash VOICE_ASSISTANT=alexa monitor

• 烧录固件

// 烧录固件之后，发现系统一直重启 
>>Registering command: task-dump 
Registering command: cpu-dump 
Registering command: heap-trace 
Registering command: nvs-get 
Registering command: nvs-set 
Registering command: nvs-erase 
Registering command: reboot 
Registering command: wifi-set
ret: 0
I (191) net80211: OS adapter function version error! Version 2 is expected, but it is 1
E (201) conn_mgr_prov: Failed to init wifi
E (211) app_main: Error getting device provisioning state
abort() was called at PC 0x400d777a on core 0
Backtrace: 0x400900c4:0x3ffc65d0 0x400902bf:0x3ffc65f0 0x400d777a:0x3ffc6610 0x400d2bb6:0x3ffc66c0
Rebooting...